Seamless tube is extruded and drawn from a billet while welded tube is produced from a strip that is roll formed and welded to produce a tube.
Welded tube is considerably less expensive than seamless tube and is readily available in long continuous lengths.
Electric Resistance Welded (ERW) pipe is manufactured by cold forming a flat steel strip into a rounded tube and passing it through a series of forming rollers to obtain a longitudinal seam.
The two edges are then simultaneously heated with a high frequency current and squeezed together to form a bond.
1. Duplex Steel 904L Welded Heat-Exchanger and Condenser Tubes Spection
| Standard | ASTM, DIN, GB, AISI, JIS, ISO, etc other International Standards |
| Dimensions | ASTM, ASME and API |
| Specifications | ASTM A249 |
| ERW Pipes & Tubes Size | 1/2″ NB – 24″ NB |
| EFW Pipes & Tubes Size | 6″ NB – 100″ NB |
| Pipes & Tubes Size | 1/2″ NB – 16″ NB |
| Length | Single Random, Double Random & Required Length or As per Customer Requirement |
| Schedule | SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS |
| Types | ERW / EFW / Welded / Fabricated / LSAW Pipes |
| Form | Round Pipes/Tubes, Square Pipes/Tubes, Rectangular Pipe/Tubes, Coiled Tubes, “U” Shape, Pan Cake Coils, Hydraulic Tubes |
| End | Plain End, Beveled End, Treaded |
| Application | Food & Beverage Industry, Construction Industry, Nuclear, Thermal & Power Plants, Petrochemical, Boilers, Cement Industry, Geothermal Plants, Heat Exchangers, Instrumentation Jobs, Mechanical Jobs, Oil and Gas Equipments and Piping Works |
| Package | Plastic caps on botd ends, Steel bundle, Woven bag or acc. to customers’ request |
2. About Duplex Steel 904L Pipe Tube
904L SS Pipes,Tubing Equivalent
| STANDARD | WERKSTOFF NR. | UNS | JIS | AFNOR | BS | KS | EN |
| SS 904L | 1.4539 | N08904 | SUS 904L | Z2 NCDU 25-20 | 904S13 | STS 317J5L | X1NiCrMoCu25-20-5 |
904L SS Pipes,Tubes Chemical Properties
| Grade | C | Mn | Si | P | S | Cr | MO | Ni | CU | |
| 904L | Min | – | – | – | – | – | 19.0 | 4.00 | 23.00 | 1.00 |
| max | 0.20 | 2.00 | 1.00 | 0.045 | 0.035 | 23.0 | 5.00 | 28.00 | 2.00 |
SS 904L Mechanical Properties
| Density | 8.0 g/cm3 |
| Melting Point | 1454 °C (2650 °F) |
| Tensile Strength | Psi – 75000 , MPa – 515 |
| Yield Strength (0.2%Offset) | Psi – 30000 , MPa – 205 |
| Elongation | 35 % |
3. Other Types Of TP SS 904L Pipes & Tubes
| Duplex Stainless Steel 904L Welded Pipe | SS 904L Welded Pipe 904L SS Welded Pipe SS 904L ERW Pipe SS 904L EFW Pipe Duplex Stainless Steel 904L ERW Pipe Duplex Stainless Steel 904L EFW Pipe 904L Duplex Stainless Steel Welded Pipe UNS N08904 Welded Pipe WERKSTOFF NR. 1.4539 Welded Pipe ASTM B673 TP 904L Duplex Stainless Steel Welded Pipes |
| Duplex Stainless Steel 904L Round Pipe | SS 904L Round Pipe 904L SS Round Pipe 904L Duplex Stainless Steel Round Pipe UNS N08904 Round Pipe SS UNS N08904 Round Pipe ASTM B677 TP 904L Duplex Stainless Steel Round Pipes |
| Duplex Stainless Steel 904L Square Pipe | SS 904L Square Pipe 904L SS Square Pipe 904L Duplex Stainless Steel Square Pipe UNS N08904 Square Pipe WERKSTOFF NR. 1.4539 Square Pipe ASTM B677 TP 904L Duplex Stainless Steel Square Pipes |
| Duplex Stainless Steel 904L Rectangular Pipe | SS 904L Rectangular Pipe 904L SS Rectangular Pipe 904L Duplex Stainless Steel Rectangular Pipe UNS N08904 Rectangular Pipe WERKSTOFF NR. 1.4539 Rectangular Pipe ASTM B673 TP 904L Duplex Stainless Steel Rectangular Pipes |
| Custom Duplex Stainless Steel 904L Pipe | SS 904L Custom Pipe 904L SS Custom Pipe 904L Duplex Stainless Steel Custom Pipe UNS N08904 Custom Pipe WERKSTOFF NR. 1.4539 Custom Pipe ASTM B673 TP 904L Duplex Stainless Steel Custom Pipes |
| Duplex Stainless Steel 904L Polished Pipe | SS 904L Polished Pipe 904L SS Polished Pipe 904L Duplex Stainless Steel Polished Pipe UNS N08904 Polished Pipe WERKSTOFF NR. 1.4539 Polished Pipe ASTM B677 TP 904L Duplex Stainless Steel Polished Pipes |
| Duplex Stainless Steel 904L Decorative Pipe | SS 904L Decorative Pipe 904L SS Decorative Pipe 904L Duplex Stainless Steel Decorative Pipe UNS N08904 Decorative Pipe WERKSTOFF NR. 1.4539 Decorative Pipe ASTM B673 TP 904L Duplex Stainless Steel Decorative Pipes |
